<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <h2>数组扁平化</h2>
</body>
<script>
    let arr=[3,4,5,56,[33,[44,4,[4,32,2],255]],66,77,88]
    console.log()
</script>
</html>